KR100366096B1 - Display device improved in brightness and contrast - Google Patents

Abstract

The present invention provides a screen comprising a panel on which a black matrix is formed, a light emitting layer formed on an inner surface of the panel, and a coating film formed between the panel and the light emitting layer and containing dysprosium (Dy) and neodymium (Nd). A display element is provided. The screen display device of the present invention can simultaneously improve luminance and contrast, and can solve the problem of instability of body color caused by external illumination.

Description

Display device improved in brightness and contrast

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a screen display device, and more particularly, to a screen display device with improved luminance and contrast characteristics.

Recently, with the spread of OA devices, portable small TVs, computers, etc., as an electronic display device, a cathode-ray tube (hereinafter referred to as a CRT), a liquid-crystal display (hereinafter referred to as an LCD), a plasma display ( Plasma-display panels (hereinafter referred to as PDPs) and light emitting diodes (LEDs) are being actively researched.

Since devices using these display devices are closely related to the user's vision, developments are being made to minimize the visual discomfort felt by the users who use them.

In general, the visible light of the user in the display device is divided into two types. As shown in FIG. 1, first, there is light 1 generated by the internal light emission of the screen display element, and then the reflected light caused by the external light source, that is, the light 2 and the glass reflected from the external surface of the glass, is shown. There is light (3) passing through and reflected back inside the glass.

Among them, the light 1 emitted from the inside of the display device has peaks in specific wavelength regions of the red (R), green (G), and blue (B) phosphors to indicate information desired by the user. By the combination of the desired color will be displayed. Therefore, since the reflected light of the external light source having a continuous wavelength in the visible light has light of a wavelength other than the light emitted from the inside, this acts as a factor to inhibit the contrast of the screen.

On the other hand, in order to improve the brightness characteristic of the screen display element, the higher the light transmittance of the panel glass is preferable. Therefore, in the past, clear glass or tint glass has been used which does not consider both transmission and reflection characteristics of the internal light emission and external light sources. However, according to the trend of the development of high-definition CRT tubes, as the pixel size becomes smaller, only the glass is adopted. There is a limit to improving the luminance characteristic.

In addition, in the relation between brightness and contrast, in order to improve the contrast, the transmittance of glass must be lowered. In this case, the luminance is lowered. On the contrary, if the transmittance is increased, the luminance is increased, but the contrast is deteriorated. There is a problem that it is difficult to improve the factor at the same time.

SUMMARY OF THE INVENTION An object of the present invention is to solve the problems described above to provide a screen display device in which the luminance and contrast characteristics are simultaneously improved and the appearance color is corrected.

1 is a partially enlarged cross-sectional view schematically showing the structure of a screen display fluorescent screen.

Figure 2 shows the transmittance of each wavelength for the semi-tint glass and the conventional semi-tint glass including a coating film containing the dysprosium and neodymium of the present invention.

The present invention to achieve the technical problem of the present invention,

A panel on which a black matrix is formed;

An emission layer formed on an inner surface of the panel; And

The display device is formed between the panel and the light emitting layer and includes a coating film containing dysprosium (Dy) and neodymium (Nd).

The light emitting layer is preferably a phosphor or color filter which emits light by an electron beam or a high voltage.

Dysprosium (Dy) and neodymium (Nd) used in the coating film are rare earth metals present in the earth's crust, and a preferable weight ratio of dysprosium (Dy): neodymium (Nd) for use in the present invention is 1: 4 to 4: 1. . If the addition amount of dysprosium is less than 1: 4 weight ratio with respect to neodymium, the absorption peak formed by neodymium is too small and the effect of neodymium addition is insignificant, and the addition amount of dysprosium exceeds 4: 1 weight ratio with respect to neodymium. In this case, the cost is higher than the effect of increasing the luminance or color reproduction range, which is not preferable. The same applies to neodymium.

The coating film may be coated with dysprosium or neodymium on the glass panel by vacuum deposition or sputtering, and the thickness is preferably 0.05 μm to 1 μm. If the thickness is less than 0.05 μm, the size of the absorption peak formed by dysprosium and neodymium is too small, so that the effect is insignificant. If the thickness is larger than 1 μm, the transmittance is lowered.

The panel on which the black matrix is formed can be manufactured by a conventional method, for example, as follows.

First, a chromium film is formed on the panel with a predetermined thickness, and a photoresist, which is a photoresist, is coated thereon, followed by mask exposure and development to form a photoresist pattern. The chromium film is treated with an etchant to form a chromium film pattern. Subsequently, by washing with pure water and stripping the photoresist positioned on the chromium film pattern with an organic solvent, a panel having a black matrix as a light blocking layer can be obtained.

The light emitting layer formed on the inner surface of the panel may be variously obtained according to a conventional method, and may vary depending on the structure of a CRT, a PDP, and an LCD.

Although an Example and a comparative example are given to this invention in more detail below, this invention is not limited to these.

Example 1

After the black matrix was formed on the semi-tint glass as in the usual method of manufacturing the black matrix of the CRT, a thin film having a thickness of 0.3 μm was formed by a vacuum deposition method of dysprosium: neodymium (1: 1 weight ratio). A CRT was prepared by forming a fluorescent film by a conventional method of forming a CRT fluorescent film thereon.

Example 2

Dspprosium and neodymium (1: 2 weight ratio) were vacuum deposited to form a thin film having a thickness of 0.3 μm between the black matrix and the color filter of the LCD, except that a thin film having a thickness of 0.3 μm was formed. .

Example 3

A thin film having a thickness of 0.3 μm was formed on the black matrix of PDP by sputtering by vacuum deposition, and then a fluorescent film was manufactured in a conventional manner. Other procedures were prepared in the same manner as the conventional PDP manufacturing method.

Comparative Example 1

A CRT was prepared by a conventional method except that a thin film of dysprosium and neodymium was prepared by the vacuum deposition method used in Example 1.

Experimental Example 1

The transmittance was analyzed for the semi tint glass obtained in Example 1 and the semi tint glass obtained in Comparative Example 1, and is shown in FIG. 2. In FIG. 2, 41 is a transmittance distribution curve of the dysprosium and neodymium coated semi tint glass of Example 1, and 42 is a transmittance distribution curve of the semitint glass of Comparative Example 1. FIG.

As can be seen in FIG. 2, the coating of dysprosium and neodymium lowers the transmittance in the vicinity of blue, corresponding to around 420 to 470 nm, and complements the color tone, while the edge region of the blue light-emitting phosphor is absorbed by the absorption band around 470 nm. The effect of forming a new absorption band in the film has occurred, improving color purity.

Experimental Example 2

When the luminance and the external reflectance of the semi-tint glass obtained in Example 1 and the semi-tint glass obtained in Comparative Example 1 were measured by the vacuum deposition method, the luminance was improved by 12% or more, and the external reflectance was reduced by 2% or more. Could.

As described above, according to the present invention, by using a coating film containing a predetermined amount of dysprosium and neodymium, luminance compared to the same contrast can be improved by about 12% or more, and appearance reflectance can be reduced by 2% or more. Therefore, the screen display device of the present invention can simultaneously improve the brightness and contrast, and solve the problem of instability of body color caused by external illumination.

Claims (4)

A panel on which a black matrix is formed; An emission layer formed on an inner surface of the panel; And And a coating film formed between the panel and the light emitting layer and containing dysprosium (Dy) and neodymium (Nd), wherein the weight ratio of the dysprosium and neodymium is 1: 4 to 4 : . The method of claim 1, wherein the light emitting layer Phosphors emitting light by an electron beam ; or Screen display element that is a color filter. delete The screen display device of claim 1, wherein the coating film has a thickness of 0.05 μm to 1 μm.